Question
Download Solution PDFIf the sum of the first n terms of a series is n(2n+1), then what is the nth term?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Given
Sn = n(2n + 1), Sn–1 = (n – 1)(2n – 1)
nth term = Sn – Sn – 1
= n(2n + 1) – (n – 1)(2n–1)
= 4n – 1
∴ Option (a) is correct.
Last updated on May 30, 2025
->UPSC has released UPSC NDA 2 Notification on 28th May 2025 announcing the NDA 2 vacancies.
-> A total of 406 vacancies have been announced for NDA 2 Exam 2025.
->The NDA exam date 2025 has been announced for cycle 2. The written examination will be held on 14th September 2025.
-> Earlier, the UPSC NDA 1 Exam Result has been released on the official website.
-> The selection process for the NDA exam includes a Written Exam and SSB Interview.
-> Candidates who get successful selection under UPSC NDA will get a salary range between Rs. 15,600 to Rs. 39,100.
-> Candidates must go through the NDA previous year question paper. Attempting the NDA mock test is also essential.